What does the passage mainly discuss? Which of the following phrases is defined in paragraph 1 ?

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问题 What does the passage mainly discuss?
Which of the following phrases is defined in paragraph 1 ?

选项 A、appreciable period(line 1)
B、photographic emulsion(line 3)
C、high-speed movement(line 5)
D、odd poses(line 11)

答案B

解析

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